No default constructor in JestResult

[markw]

We are trying to upgrade to the latest version of Jest.

The removal of the default constructor for JestResult broke all of our testing code with Groovy and Spock, since we can't write code like the following:

1 * dao.jestClient.execute(_) >> new JestResult([succeeded:true])

Even a private default constructor would be acceptable, at least Groovy could find it and invoke it.